Operating mechanism for steam-shovels.



E. HAWKINS. OPERATING MECHANISM FOR, STEAM SHOVELS.

APPLICATlUN FILED JUNE 2, I91]- 5 7 1,250,868. Patented Dec. 18, 1917.

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Patented Dec. 18, 1917.

2 SHEETS-SHET 2.

, ELWOOD HAWKINS, or ATLANTIC CITY, NEW JERSEY.

OPERATING MECHANISM FOR STEAM-SHOVELS.

To all whom it may concern:

Be it known that I, ELwooD HAwKINs, a citizen of the United States, and resident of Atlantic City, in the county of Atlantlc and State of New Jersey, have invented certaln new and useful Improvements in Operatlng Mechanism for Steam-Shovels, of which the following is a specification. v

v This invention relates to new and useful improvements in excavating mach1nes, and more specifically. to an operatmg mechanlsm for steam shovels, embodying asafety attachment which will automatically reverse the operation of the dipper operatlng engine.

A further object of the invention resldes in a novel arrangement of an operating means for steam shovels of this character including. a dipper control mechanlsm and latch operating mechanism, that are nor- :mally operable at will, and which have a safety attachment associated therewith, that is adapted to reverse the OPQIZLtlOIl' of the dipper control mechanism when the boom of the steam shovel is lifted.

Still another object of the invention is to provide a device of this character wh1ch 1s easily and simply constructed, inexpenslve to manufacture, and one which will be very efficient in operation.

With these and numerous other objects in view, my invention consists of the novel features of construction, combination and arrangement of parts which will be herein referred to andmore particularly pointed out in the specification and claims.

In the accompanying drawings:

Figure 1 is a' side elevation of the improved operating mechanism;

Fig. 2 is a detail perspective view of safety attachment;

Fig; 3 is a detail perspective view of the reversemechanism; and

Fig. 4 is 'an enlarged plan view of the cog the wheel showing the association therewith o the latch operating chain.

In describing my invention I shall refer to the drawings in which similar reference characters designate corresponding parts throughout the several views. This invention is adapted to :be placed upon an excavator of the conventional type which is provided with a turn table 5, arranged on a platform 6, carrying a swinging boom 7, an adjustable dipper arm 8, and a dipper 9.

Specification of Letters Patent.

Application filed. June 2, 1917. Serial No. 172,488.

,therewith'.,;

The standard lower end of the swinging boom Tisbifur- :cated, and mounted between 'theiside por- -.tions,thereof are'ia-pair" of horizontally extending transverse shafts 23, and 24 Patented Dec/18,1917.

Fixed on the platform 6 adj acentthe turn table 5 is a standard 1 that extends forwardly and upwardly, and is provided with an extending head portion 2, that forms a guide upon which is mounted a pair of cross heads 3 in spaced superposed relation, said cross heads carrying ring members 4: and 5, respectively designating the upper and lower members upon which are mounted rings 10 provided with forwardly projecting rods 11. The ring members 4 and 5 that are connected with the cross heads are adapted to be normally held in raised position by coiled springs 12 that are connected with a bracket 13 securedto the upper end of the a standard, 1. These spring members are raised and lowered by hand levers Hand 15 respectively that are' connected therewith by novel arrangement of parts which is spe'cifically described and claimed 'in my former Patent #1,222,205, dated April 10th, 1917. Thisconstruction is fully set forth in detail,

and the operation thereof forms nopart of the safety attachment that forms the subject matter of this application. The steam shovel is provided with the-conventional type of haulage chain or cable 16 that is trained over a. pairof pulleys mounted on standards 17 and 18 onthe swingingboom, which has one end connected with the dipper 9, andthe other extending through thering members 4 and 5, over apulley 19 mounted through an opening in the platform 6, and hence to a winding drum not shown.

. The swinging boom 7 is provided with an auxiliary dipper operating engine 20, the

operation of which is controlledjby movement of the ring member 5 in a manner to be hereinafter more fully described, and a latch releasing mechanism, including a cog wheel 21, that is operated by movement of the ring member l, as will be'hereinafter more fully and specifically-set forth. The cog'21 over which is traineda latch releasing chain is provided with a drum portion having projections 22 on the inner faces thereof adapted to receive thelinks of the chain therebetween, so as to insure a positive engagement 17 which i adjacent the respectively, said shafts being rotatably mounted and loosely connected with the forward ends of the projecting rods 11 on the ring members 4 and 5 respectively. This connection will rock the shafts. 23 and 24 upon respective sliding movement of the ring members.

The shaft 24: that is operatively connected with the lower ring member 5 has one end projecting through the side of the standard 17, and mounted thereon an arm 25. A forwardly extending link member 26 has its rear end bifurcated, and connected with the free end of the arm 25, while the opposite end thereof is connected with an arm 27, which operates the throttle of the auxiliary engine 20 on the'swinging boom 7. The ring member 5 is normally in raised position due to the tension of the coil spring 12, but when the same is lowered upon movement of the hand lever 15, the shaft 24: will be rocked owing to the connection hereinbefore de scribed, and the links 26 will be correspondingly moved to rock the arm 27, and open the throttle of the engine, so as to operate the dipper 9.

The shaft 23 that is associated with the upper ring member 4, has one end thereof, projecting through the opposite side of the standard 17 from which the end of the shaft 2%1 projects, and an arm 28 is secured to the free end thereof. A link 29 connects said arm with a pivotally. mounted lock pawl 30 on the swinging boom 7, that is adapted for engagement with the cog wheel 21 to lock the same, whereby the latch mechanism will be released, by any desired means preferably the means employed in my previous Patent My new and improved safety attachment is operatively associated with said last men tioned latch operating means, and the same includes a shaft 31 rotatably mounted through the standard 17 adjacent the shaft 23, said shaft 31 having a flattened depending portion 32 disposed in alinement with the connection between the rod 11, and the shaft 23. This shaft 31 has one end projecting through the standard 17, and an arm 33 formed thereon. A lifting member 34:, which is preferably formed of a substantially U- shaped iron piece, is disposed beneath the lower ring member 5, and has its opposite ends journaled on a shaft 35 on the swing mg boom 7 adjacent the lower end thereof, one end thereof projecting as shown at 36, and connected with the arm 33 by a link 37.

In operation the ring members 4 and 5 are normally disposed in raised position and are operable by movement of the hand levers lat and 15 to control the operation of the steam shovel. The ring members 4 and 5 can be raised or lowered controlling the operat on of the engine 20 and the locking pawl 30 respectlvely, without disturbing the safety attachment, that includes the lifting member disposed beneath the lower ring member 5. The lifting member remains idle until the boom 7 is pushed up by accident, by the bucket and arms 9 and 8, this occurs when the engine 20 gets too much steam by the operator forcing the ring member 5 below its normal working position. As the boom 7 starts to lift as mentioned above, the arm 11 on the upper ring member 4. comes in contact with the piece 32, which will raise the lifting member 34, owing to its connection therewith through the rocking of the shafts 31 and 35. This movement will raise the ring member 1, and reverse the engine 20,

allowing the boom 7 to drop back to its normal position, as shown in Fig. 1 of the drawing. From the foregoing it will be obvious that the safety attachment is only operable when the boom 7 is lifted by undue operation of the engine that controls the movement of the dipper arm and bucket. safety attachment is normally out of operative position, and the various other controlling parts of the device may be operated freely.

From the above description taken in connection with the accompanying drawings, it is thought that a clearand comprehensive understanding of the construction, operation, and advantages of my invention may The be had, and while I have shown and described the device embodying a specific structure, I desire that it be understood that such changes may be made in said structure as do not depart from the spirit and scope of the invention as claimed.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is: V

1. The combination with a steam shovel of the class described including a swinging boom, having a bucket and arm associated therewith, a latch for said bucket, an auxiliary operating engine, a pair of superposed vertically slidable members adapted to control the operation of the bucket latch and auxiliary operating engine respectively, of a lifting member disposed beneath the en gine control member, and a connection between the lifting member and the latch operating member operable when the boom is lifted by undue movement of the arm and bucket.

2. The combination with a steam shovel of the class described including a swinging boom having an arm and bucket associated therewith, a latch for said bucket, an auxiliary operating engine on said boom, a pair of superposed vertically slidable members adjacent said boom, a separate mechanism,

connecting said members with the operating operating mechanism to lift said member upon undue movement of the boom.

3. The combination with a steam shovel of the class described including a swinging boom having an arm and bucket associated therewith, a latch for said bucket, an auxiliary operating engine on said boom, a pair of superposed vertically slidable members adjacent said boom, a separate mechanism connecting said members with the dipper operating engine and latch on said boom respectively, an arcuate lifting member pivotally mounted on said boom and disposed beneath the engine control member, and means for operating said lifting member upon undue movement of the swinging boom.

4. In an excavator, the combination with a dipper, a latch therefor, an engine for operating said dipper, a swinging boom, a standard, a pair of pivoted shafts carried thereby and adapted to control the opera tion of the dipper latch and engine respectively, an arm on the latch controlled shaft, a lifting member journaled on said boom adjacent the standard, an arm projecting therefrom, and a link connecting said arm.

In testimony whereof, I affix my signature hereto.

ELWOOD HAWKINS,

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. 0. 

